Improvement in portable boilers



UNITED STATES PATENT FFICE.

THOMAS MCBRIDE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN PORTABLE BOILERS.

Specication forming part of Letters Patent No. 218,547, dated August 12,1879; application filed March 26, 1879.

To all whom it 'may concern:

Be it known that I, THOMAS MGBRIDE, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a certain new anduseful Roofing-Boiler for Melting Tar, Pitch, &c. 5 and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and useit, reference being had to the accompanyingdrawings, which form part of this speciication, in which- Figure l is atransverse vertical section of my invention; Fig. 2, a side elevation;and Fig. 3, a plan, partly in section, showing the boiler placed inposition on a wagon, which is also in plan.

My invention has for its object to provide a portable boileror'melting-pot for tar, pitch, asphaltum, Ste.

My improvements consist in the peculiar construction hereinafterdescribed.

Referring to the accompanying drawings, A indicates a Wagon or vehicle,upon which is mounted the furnace B. Said furnace contains themelting-pot C, which is formed with an annular iange, c, on which restsa flanged lid, c', over which is itted a slip-top,C1, which serves as aprotector against rain.

The melting-pot or boiler G is of such a diameter and so arranged as toleave between it and the Wall of the furnace a combustion or heat space,D, in which the flames will play and eHect-ively heat said pot, theflueopening being located near the top of said space, so th at the draftwill cause the flames to rise.

The jacket extends some distance below the bottom of the pot C, and hasa perforated diaphragm or grate, d', forming a lire-box, E, and ash-pitF, with respective doors e and f.

G is a pipe proceeding from the bottom of the pot C outwardly throughthe walls of the jacket D, and furnished with a cock, H.

l represents a smoke-pipe, and K K'manholes with sliding doors k,whereby access may be had to the sides of the pot to remove soottherefrom.

The operation is as follows: Before starting out in the morning the tar,pitch, asphalt, or other material required for use in roofing, roadway,or other purposes, is placed in the pot C, and a fire is started in there-box E. On arrival at the point of operation, if sufficiently distant,the roon g material is melted and in condition for immediate use,thereby obviating the delay and loss of time incident to the usualmethod of setting up a stationary boiler at the place where the workrequires to be done and starting a re beneath it. The melted material isdrawn off through the cock, instead of being ladled out in the usualmanner, being a more expeditious and less laborious and wastefuloperation than the old method. The jacket D retains the heat around thepot, thereby greatly economizing the fuel required for the boiler.

By locating the pipe G directly over the tire-box the material within itis kept constantly molten while the boiler is in operation, the heatretained within the jacket aiding this result, whereas if no jacket wereprovided and the pitch, 85e., were drawn from the side of the pot, saidmaterial would quickly chill and harden and fail to flow through thecock. This construction also serves to prevent the formation of a cruston the bottom of the pot.

I should remark that the boiler orpot C is formed with an externalannular flange, G2, whereby it is supported in position on the jacket D;also, that the mouth of the pot is provided with a wide annular iiange,c, on which the lid rests, said flange preventing any splashing over ofthe material in the pot when the boiler is being transported.

What I claim as my invention is'- 1. The improved portable boiler formelting tar, pitch, zc., consisting of the furnace B, containing thefire-box E and ash-pit F, the meltingpot C, provided with the centraldrawoff pipe, G, passing through the fire chamber or box and out throughthe wall of the furnace, the pot C being provided with the anged rim C2,resiing upon and embracing the jacket B, and the pipe G being furnishedwith the cock H, all as shown and described.

2. The combination, with the melting-pot C, having flanged mouth c andflanged lid c, of the slip-top C1, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this21st day of 'March, 1879.

THOMAS MCBRIDE. Witnesses:

GEO. G. SHELMERDINE, SAML. J. VAN STAVOREN.

